linux-kernel - Re: [PATCH] minix: fix add link

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Message-Id: <20081230153230.8e72dc88.akpm@linux-foundation.org>
Date:	Tue, 30 Dec 2008 15:32:30 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Evgeniy Dushistov <dushistov@...l.ru>
Cc:	npiggin@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] minix: fix add link - wrong position calculation

On Mon, 29 Dec 2008 02:25:50 +0300
Evgeniy Dushistov <dushistov@...l.ru> wrote:

> This patch fixes add link method.
> Position in directory was calculated in wrong way.
> 
> Signed-off-by: Evgeniy Dushistov <dushistov@...l.ru>
> ---
>  fs/minix/dir.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/minix/dir.c b/fs/minix/dir.c
> index f704338..4b603b7 100644
> --- a/fs/minix/dir.c
> +++ b/fs/minix/dir.c
> @@ -280,7 +280,7 @@ int minix_add_link(struct dentry *dentry, struct inode *inode)
>  	return -EINVAL;
>  
>  got_it:
> -	pos = (page->index >> PAGE_CACHE_SHIFT) + p - (char*)page_address(page);
> +	pos = page_offset(page) + p - (char*)page_address(page);
>  	err = __minix_write_begin(NULL, page->mapping, pos, sbi->s_dirsize,
>  					AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
>  	if (err)

Well that's cute.  Seems that we broke it over a year ago:

commit 4a66af9eaa9531372cfcb9e20103ed147c729ff9
Author:     Nick Piggin <npiggin@...e.de>
AuthorDate: Tue Oct 16 01:25:21 2007 -0700
Commit:     Linus Torvalds <torvalds@...dy.linux-foundation.org>
CommitDate: Tue Oct 16 09:42:57 2007 -0700

    minixfs: convert to new aops

Is minixfs getting THAT little use, or is this bustage more subtle
than it appears?
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